US4467593A - Method and apparatus for automatically controlling winding tension of a roving in a roving machine - Google Patents

Method and apparatus for automatically controlling winding tension of a roving in a roving machine Download PDF

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Publication number
US4467593A
US4467593A US06/432,988 US43298882A US4467593A US 4467593 A US4467593 A US 4467593A US 43298882 A US43298882 A US 43298882A US 4467593 A US4467593 A US 4467593A
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Prior art keywords
bobbin
roving
value
rotational speed
winding
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Expired - Fee Related
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US06/432,988
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English (en)
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Hidejiro Araki
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Toyota Industries Corp
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Toyota Industries Corp
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Assigned to KABUSHIKI KAISHA TOYODA JIDOSHOKKI SEISAKUSHO reassignment KABUSHIKI KAISHA TOYODA JIDOSHOKKI SEISAKUSHO ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ARAKI, HIDEJIRO
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material

Definitions

  • This invention relates to a bobbin lead roving machine and more particularly to a method and apparatus for controlling the winding tension of the roving through adjustment of the bobbin r.p.m.
  • the roving machines currently employed are of the bobbin lead type in which the roving is wound on the bobbin on the basis of the difference between the bobbin r.p.m. and the flyer r.p.m. (winding r.p.m.) which is less than said bobbin r.p.m.
  • the roving travelling from the front roller is subjected to a slight elongation (known as indefinite draft) while the roving is supplied through the slot in the main body of the flyer and flyer presser and wound on the bobbin, whilst the roving is twisted by the flyer rotation. Due to such draft, the winding speed of the roving is slightly higher than the spinning speed at the front roller. If a constant roving speed is desired, it is necessary to maintain this indefinite tension constant from the start of winding until the bobbin is full.
  • FIG. 2 is a plan view of the bobbin for illustrating the method of measuring the bobbin diameter
  • FIGS. 3A and 3B are front views of the bobbin ;
  • FIG. 4 is an enlarged sectional view showing the essential parts of the bobbin
  • FIG. 5 is a plan view of the bobbin for illustrating a modified measuring method
  • FIG. 6 is a block diagram showing the bobbin r.p.m. control portion and the micro-computer portion of the inventive control device;
  • FIG. 7 is an illustrative view showing the overall control device.
  • FIG. 8 is a partial view showing essential portions of a modified control device according to the present invention.
  • the system of controlling the bobbin r.p.m. based on the measured values of the bobbin diameter and bobbin and flyer r.p.m.'s according to the present invention may be said to be reasonable as compared to the conventional method for spinning the roving under a constant tension.
  • the principle of the present invention and the method for controlling the bobbin r.p.m. in accordance therewith is now described by referring to the accompanying drawings.
  • the spinning speed from the front roller is V cm/min.
  • the flyer r.p.m. N F the bobbin diameter D B cm and the occasional bobbin r.p.m. N B , the roving winding condition for a bobbin lead roving machine is defined by
  • the term (N B -N F ) represents the aforementioned winding r.p.m. and a the aforementioned indefinite draft.
  • the indefinite draft a represents the ratio of the winding speed to the spinning speed V.
  • An optimum value for the indefinite draft is selected in consideration of the machine construction and the spinning conditions and must be maintained constant from the start of winding until the bobbin is full.
  • the flyer r.p.m. N F and the spinning speed V are constant, so that the bobbin r.p.m. is inversely proportional to the bobbin diameter D B .
  • a control device making use of a positive infinitely variable speed changer (PIV speed changer) and a speed change cam or a hyperboloid cone drum are used for controlling the bobbin r.p.m.
  • PV speed changer positive infinitely variable speed changer
  • a speed change cam or a hyperboloid cone drum are used for controlling the bobbin r.p.m.
  • spinning the roving under a constant roving tension is a matter of great technical difficulty when only a single kind of the cone drum or cam is used for spinning the roving under varying spinning conditions, as mentioned above.
  • the roving is apt to break due to the centrifugal force acting on the roving wound on the bobbin.
  • the pressure exerted by the flyer presser is changed with the number of revolutions which makes it more difficult to maintain the constant roving tension. Therefore, for the purpose of theoretical elucidation, the flyer r.p.m. N F is assumed to be variable. In effect, even supposing that N F is constant, the value of N F is thought to be changing slightly due to transmission loss or load fluctuations. Therefore, the value of N F may be reasonably treated as variable. In such case, the spinning speed V is given by the following formula.
  • D B is inversely proportional to N B /N F .
  • K is a quantity including the indefinite draft a and hence will be used in the following description in place of indefinite draft a.
  • the bobbin r.p.m. N B is given by the following equation (4). ##EQU2##
  • This equation (4) is used in the present invention for precisely controlling the bobbin r.p.m. It is assumed that D B represents the bobbin diameter as measured at a given time point during spinning, and that N B , and N F represent the bobbin r.p.m. and the flyer r.p.m. as measured at the same time point. It is also assumed that K O represents a design value for K (the value for K corresponding to the optimum slack of the roving between the front roller and the flyer top at the initial stage of winding on the drum) and K' represents the value for K corresponding to the above measured values and obtained from the above equation (3)'.
  • a device for compensating the bobbin r.p.m. may be operated only when the offset ⁇ K exceeds a preset control limit ⁇ K for correcting the bobbin r.p.m. N B to a value defined by the above equation N B .
  • the value K is plotted on the vertical axis, and the bobbin diameter or spinning length is plotted on the horizontal axis.
  • the horizontal line 00' represents a preset design value K O for K, and the value for K is changed as shown by a curve S when the bobbin r.p.m. is not compensated in the manner described above.
  • the curve S exceeds the lower control limit line L.C.L. at point P 1 .
  • the device for correcting the bobbin r.p.m. is set into operation for increasing the bobbin r.p.m. until the value K is equal to its design value K O at point P 2 .
  • the value K is changed as shown by a curve S' and exceeds the upper control limit line L.C.L. at point P 3 .
  • the device for correcting the bobbin r.p.m. is set into operation for decreasing the bobbin r.p.m. so that the value K equals to its design value K O .
  • the roving winding tension expressed by the value K may be controlled to be within an allowable limit from the start of winding until the bobbin is full.
  • the roving tension control device of the present invention is made up of measuring portions for respectively measuring the bobbin diameter D B , bobbin r.p.m. N B and flyer r.p.m. N F , a micro-computer portion for calculating the offset ⁇ K from the measured values for D B , N B and N F supplied thereto and issuing an instruction when the offset ⁇ K has exceeded the control limit value ⁇ K, and a bobbin r.p.m. control device portion responsive to said instruction for controlling the bobbin r.p.m. in the above manner.
  • the bobbin r.p.m. N B and the flyer r.p.m. N F can be measured by any existing r.p.m. sensor mounted to rotating shafts and transmitted as input signals to the micro-computer portion.
  • the non-contact method is used in the present invention for measuring the bobbin diameter.
  • Several non-contact methods making use of light beams such as laser or infrared beams, ultra-short electromagnetic waves or supersonic waves are so far known and utilized for measuring the distance with high accuracy.
  • FIG. 2 One method for measuring the bobbin diameter by using such non-contact distance measurement method is shown in FIG. 2, wherein the bobbin diameter is obtained by measuring a distance l from a base point 1 of the measuring device to the surface of a bobbin 2.
  • L designates a distance between the base point 1 and the center of the bobbin 2.
  • the numerals 3a, 3b designate flyer legs and the numeral 4 designates a flyer presser.
  • FIGS. 3a and 3b for describing the measuring position lengthwise of the bobbin. Assuming that the bobbin diameter is measured at point A on the roving surface, when the bobbin 2 is travelling down as shown in FIG.
  • the roving tension is corrected only for each other layer, which however is practically acceptable.
  • the measuring position A it is necessary to take the mean value because the outer periphery of the roving layer is formed by the helically wound roving with a circular cross-section and presents an irregular surface.
  • a measuring position B corresponding to a mid height of a battledore plate 4' of the flyer presser, it is possible to measure the outside diameter D 1 of the layer of the roving extracted from the battledore plate 4' of the flyer presser without regard to whether the bobbin 2 is making an upward or downward stroke. In this case, however, it is necessary to provide a device for synchronizing the measuring operation with the flyer movement so that the measurement may be performed at the outer periphery of the bobbin where the flyer presser 4 does not hinder the measuring operation.
  • the bobbin diameter is measured, not by directly measuring the distance from the base point of the measuring device to the bobbin surface, but by measuring the distance between the base point of the measuring device and an intermediary member mounted for permanently contacting with the outer bobin surface.
  • the flyer presser is most preferred as such intermediary member.
  • the flyer presser is mounted to the main body of the flyer and plays the role of guiding the roving and applying a pressure to the outer bobbin surface under a centrifugal force caused by flyer rotation so that the roving may be wound tightly on the bobbin.
  • the outer bobbin surface is dented slightly at the contact portion with the presser under the pressure exerted from the presser, and the roving is wound at this dented portion on the bobbin, it is evidently most effective to measure the bobbin diameter at such contact portion.
  • the presser is used as intermediary member, the outside diameter of the roving layers on the bobbin can be measured without regard to whether the bobbin is travelling up or travelling down, as discussed with respect to the measuring position B in FIGS. 3A and 3B.
  • the mean bobbin diameter can be measured advantageously since the presser battledore plate 4' is pressured against plural adjacent turns of the roving.
  • the presser is usually of metallic material, and a member of the shape and material suitable for measurement can be mounted to the presser battledore plate, thus facilitating the measurement through non-contact measuring process.
  • FIG. 5 shows a method of measuring the bobbin diameter with the aid of such flyer presser.
  • the presser 4 is shown by the double-dotted chain line when at the start of winding and by the solid line when the bobbin is nearly full.
  • the presser is mounted for rotation about an axis Q of a flyer leg 3b and may be moved from the double-dotted chain line position 4a to the solid line position 4 with increase in the bobbin diameter.
  • the presser is shown to be rotatable about axis Q only for simplicity of the drawing and the axis of presser rotation is not necessarily coincident with the axis of the flyer leg.
  • the difference t is not always constant, since the presser contact angle is changed with the bobbin diameter.
  • the radius R is changed with the bobbin diameter. It is therefore preferred to find the value R for the range of changes in the bobbin diameter in advance and store the relation in a micro-computer.
  • the bobbin diameter can then be measured through measurement of the distance l p and without regard to the changes in the quantity t. It is however necessary to control the measurement operation so as to be synchronized to the flyer rotation so that the rotating flyer legs 3a, 3b may not prove to be a hindrance to the measuring operation.
  • FIG. 6 shows in a block diagram the structure of the micro-computer portion of the control device.
  • E designates the measurement portion, F the micro-computer portion, and G the bobbin r.p.m. control portion.
  • a comparator circuit for finding the offset between K and K O and comparing the resulting offset with the control limit ⁇ K.
  • a memory circuit is provided for storage of a set of design values K O corresponding to changing bobbin diameters, in cases where the resistance offered to the roving is changed with the bobbin diameter and such change in the resistance is not negligible.
  • An amplifier circuit for receiving and amplifying the output signals from the comparator circuit and an output relay circuit for forward or reverse operation of the electric motor associated with the bobbin r.p.m. control device may also be provided in the micro-computer portion.
  • the operating motor When the quantity K has exceeded the control limit, the operating motor is driven in the forward or reverse direction for reducing or increasing the bobbin r.p.m. through operation of the bobbin r.p.m. control device.
  • the resulting value for K is again measured and introduced into the micro-computer portion for repeating the aforementioned control loop. Since it is known experimentally that changes in the roving tension and hence in K caused under varying spinning conditions are extremely slow as shown by way of an example by curve S in FIG. 1, the number of times of bobbin r.p.m. correction can be reduced by once setting the quantity K to its design value K O when the value K has exceeded its control limits U.C.L. or L.C.L. shown in FIG. 1.
  • FIG. 7 shows an embodiment of the control device of the present invention applied to a roving machine having a bobbin speed changer including a pair of cone drums in a known manner.
  • rotation is transmitted from a main motor 5 to a front bobbin roller 6, flyer 3 and a top cone drum 7 through rotation transmission means such as gearing or timing belt.
  • Rotation from main motor 5 and rotation from the bottom cone drum 9 driven by top cone drum 7 and belt 8 with a variable speed corresponding to the changing bobbin diameter are combined in a differential unit 10 and transmitted to the bobbin 2.
  • Rotation of the bottom cone drum 9 is transmitted further to a vertical motion system, not shown, of a bobbin rail 11 for imparting a vertical motion to the bobbin 2.
  • the bobbin speed device shown in FIG. 7 is designed to provide for both the conventional belt feed and correction belt feed by annexing a differential gearing H to a conventional belt shift system adapted for shifting the cone drum belt 8.
  • a rack 13 has a belt shifter 12 and meshes with a gear 16 mounted on a shaft 15 rotated in turn upon downward travel of a counterweight 14.
  • the gear 16 is operatively connected with a gear 17 coaxial therewith, a planetary gear 18 of a planetary gearing, a gear 20 on a shaft 19 coaxial with shaft 15, and with a ratchet wheel through a set of pinions 21, so that the gear 16 is rotated intermittently whenever a new roving layer starts to be formed and a pawl, not shown, is disengaged from the ratchet wheel, the cone drum belt 8 being thereby shifted a predetermined distance in the direction of the arrow mark for changing the r.p.m. of the bottom cone drum 9 and hence the r.p.m. of the bobbin 2.
  • the operating motor 23 forming a main part of bobbin r.p.m. control means is driven into forward or reverse rotation for effecting a compensation or correction belt shifting.
  • a worm 24 is rotated by rotation of the motor 23.
  • the worm 24 meshes with a worm wheel 25 so that the planetary gear 18 is rotated about axis of shafts 15, 19. Since the shaft 19 is fixed by operation of the ratchet wheel 22 and the pawl meshing therewith, the shaft 15 is now rotated by rotation of the gear 18 through gear 17 so that the belt 8 is advanced or receded a required length through gear 16, rack 13 and belt shifter 12 for compensating the bobbin r.p.m. as required for resetting the control value K. It is to be noted that any other known methods or apparatus for compensation belt shifting may be used within the scope of the present invention.
  • one or plural non-contact distance measuring devices la are mounted on the machine bed as a function of the number of bobbin to be measured.
  • Each device la operates for a predetermined time interval by instructions supplied from a flyer position synchro unit 26 or from the unit 26 and a bobbin position sensor, not shown, for measuring the distance l(FIG. 2) or l p (FIG. 5) and transmitting the resulting information to the micro-computer, where the bobbin diameter is calculated.
  • the sync unit 26 may be designed to contact other rotating elements having the same r.p.m. as the flyer, and thus need not contact directly with the flyer.
  • the flyer r.p.m. is measured with a rotary sensor 27.
  • flyer of the overall machine bed is driven by engagement of a gear 29 on a flyer driving shaft 28 and a gear 30 on the flyer 3, it is only necessary to provide a single set of flyer r.p.m. sensor 27 for the drive system of the shaft 28.
  • one set of bobbin r.p.m. sensor 31 is mounted to the drive system for the bobbin driving shaft 32.
  • the resulting r.p.m. signals are transmitted to the micro-computer M for operation of the control value K and offset ⁇ K, the resulting signal current being then amplified by the amplifier N and transmitted to the output relay W for driving the operating motor 23.
  • the route of signal transmission is shown by a thin solid line.
  • the present invention can also be applied to a roving machine having a bobbin r.p.m. control device consisting of a combination of an operating cam and the positive infinitely variable (P.I.V.) speed changer.
  • belt shift means of a roving machine making use of a pair of cone drums can be simplified by application of the invention means.
  • the conventional belt feed system adapted for shifting the belt 8 a predetermined distance through counterweight 14 and ratchet wheel 22 (FIG. 7) for each new roving layer on the bobbin is dispensed with, and the operating motor 23' is rotated intermittently as shown schematically in FIG. 8.
  • the present invention makes it possible to find the control value K instantly, to supply the micro-computer signals to the r.p.m. change unit of the stepless speed change motor during steady state operation and starting for controlling the rotational speed and to control the braking torque of the motor during stop for maintaining the constant winding tension of the roving.
  • the stepless speed change motor may be used practically in the bobbin speed change system.
  • the winding speed of the roving can be controlled by using a mathematical equation representing theoretical winding conditions and while indefinite draft applied from the roving machine front roller to the roving is measured simultaneously. Therefore, the indefinite draft can be maintained within a preset control limit from the time the winding is started until the bobbin is full, resulting in the constant winding tension, uniform roving weight and the constant number of deniers of the resulting roving.
  • the indefinite draft or winding tension, variable with occasional spinning conditions may be set easily, and the design value thereof stored in the micro-computer can be adjusted through visual inspection of the slack in the roving travelling between the front roller and the flyer top at the start of winding. In this manner, once the design value and the control limit are set and stored in the micro-computer, the subsequent winding operation is controlled automatically by the micro-computer until the bobbin is full. Thus the operation of the device may be facilitated without requiring any special skill.
  • the conventional bobbin speed change devices can be simplified and combined with bobbin r.p.m. correcting device.
  • the present invention has practical merit in that the winding tension of the roving can be controlled automatically by resorting to the art of micro-computer and measurement technology.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US06/432,988 1981-10-09 1982-10-06 Method and apparatus for automatically controlling winding tension of a roving in a roving machine Expired - Fee Related US4467593A (en)

Applications Claiming Priority (2)

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JP56161472A JPS5865012A (ja) 1981-10-09 1981-10-09 粗紡機の粗糸巻取張力自動制御方法および装置
JP56-161472 1981-10-09

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4551969A (en) * 1983-08-02 1985-11-12 Howa Kogyo Kabushiki Kaisha Apparatus for controlling the winding speed of roving in roving frame
US4628676A (en) * 1985-01-14 1986-12-16 Maschinenfabrik Niehoff Kg Method and apparatus for laying stranded rope-like material on a reel
US4698957A (en) * 1985-01-25 1987-10-13 Veb Kombinat Textima Method of controlling a roving machine having a decentralized drive system
US4899286A (en) * 1986-12-23 1990-02-06 Savio, S.P.A. Process for determining the optimum winding speed, as well as the optimum winding parameters for each type of yarn
US5341633A (en) * 1989-06-30 1994-08-30 Howa Machinery, Ltd. Apparatus for winding a roving applied to a roving frame
US5469696A (en) * 1992-10-29 1995-11-28 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device to determine the diameter of a bobbin at a spinning station of a spinning machine
US5560193A (en) * 1993-04-27 1996-10-01 Howa Machinery, Ltd. Method and device for winding a roving in a flyer frame
US5802833A (en) * 1995-05-22 1998-09-08 Romano Boni Textile machine for forming yarn windings of any shape
US6247664B1 (en) * 1999-06-25 2001-06-19 Siecor Operations, Llc Reel monitor devices and methods of using the same
CN103014933A (zh) * 2011-09-23 2013-04-03 欧瑞康纺织有限及两合公司 生产卷绕成粗纱筒子的粗纱的粗纱机和粗纱机运行方法
CN103827008A (zh) * 2011-06-30 2014-05-28 里特机械公司 用于粗纱卷缠机的按压器指状物，粗纱卷缠机，和卷缠粗纱的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04370229A (ja) * 1991-06-12 1992-12-22 Howa Mach Ltd 粗紡機の粗糸巻取方法

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US3986330A (en) * 1974-04-10 1976-10-19 Evolution Sa Method of and apparatus for twisting a yarn
US4056926A (en) * 1975-06-07 1977-11-08 Otto Stuber Kg Method and apparatus for detecting so-called moire effect during spinning
US4134253A (en) * 1977-04-01 1979-01-16 Aichi Spinning Co., Ltd. Method and apparatus for winding roving with constant tension on bobbin on bobbin-lead type roving frame
US4168604A (en) * 1977-03-22 1979-09-25 Zellweger, Ltd. Method and apparatus for evaluating yarn signals based on the detection of at least approximately periodic variations in cross section
US4375744A (en) * 1979-09-28 1983-03-08 Rieter Machine Works Ltd. Apparatus for controlling the rotational speed of the spindles of a spinning preparatory machine

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US4146376A (en) * 1977-12-30 1979-03-27 Owens-Corning Fiberglas Corporation Microcomputer controlled winder
DE2817711C2 (de) * 1978-04-22 1983-08-18 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Vorrichtung zum Steuern des Spulenantriebes einer Flügel-Vorspinnmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986330A (en) * 1974-04-10 1976-10-19 Evolution Sa Method of and apparatus for twisting a yarn
US4056926A (en) * 1975-06-07 1977-11-08 Otto Stuber Kg Method and apparatus for detecting so-called moire effect during spinning
US4168604A (en) * 1977-03-22 1979-09-25 Zellweger, Ltd. Method and apparatus for evaluating yarn signals based on the detection of at least approximately periodic variations in cross section
US4134253A (en) * 1977-04-01 1979-01-16 Aichi Spinning Co., Ltd. Method and apparatus for winding roving with constant tension on bobbin on bobbin-lead type roving frame
US4375744A (en) * 1979-09-28 1983-03-08 Rieter Machine Works Ltd. Apparatus for controlling the rotational speed of the spindles of a spinning preparatory machine

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4551969A (en) * 1983-08-02 1985-11-12 Howa Kogyo Kabushiki Kaisha Apparatus for controlling the winding speed of roving in roving frame
US4628676A (en) * 1985-01-14 1986-12-16 Maschinenfabrik Niehoff Kg Method and apparatus for laying stranded rope-like material on a reel
US4698957A (en) * 1985-01-25 1987-10-13 Veb Kombinat Textima Method of controlling a roving machine having a decentralized drive system
US4899286A (en) * 1986-12-23 1990-02-06 Savio, S.P.A. Process for determining the optimum winding speed, as well as the optimum winding parameters for each type of yarn
US5341633A (en) * 1989-06-30 1994-08-30 Howa Machinery, Ltd. Apparatus for winding a roving applied to a roving frame
US5469696A (en) * 1992-10-29 1995-11-28 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device to determine the diameter of a bobbin at a spinning station of a spinning machine
US5560193A (en) * 1993-04-27 1996-10-01 Howa Machinery, Ltd. Method and device for winding a roving in a flyer frame
US5802833A (en) * 1995-05-22 1998-09-08 Romano Boni Textile machine for forming yarn windings of any shape
US6247664B1 (en) * 1999-06-25 2001-06-19 Siecor Operations, Llc Reel monitor devices and methods of using the same
US6409117B2 (en) * 1999-06-25 2002-06-25 Corning Cable Systems Llc Reel monitor devices and methods of using the same
CN103827008A (zh) * 2011-06-30 2014-05-28 里特机械公司 用于粗纱卷缠机的按压器指状物，粗纱卷缠机，和卷缠粗纱的方法
CN103014933A (zh) * 2011-09-23 2013-04-03 欧瑞康纺织有限及两合公司 生产卷绕成粗纱筒子的粗纱的粗纱机和粗纱机运行方法
CN103014933B (zh) * 2011-09-23 2016-08-03 索若德国两合股份有限公司 生产卷绕成粗纱筒子的粗纱的粗纱机和粗纱机运行方法

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JPS611529B2 (en)van) 1986-01-17
JPS5865012A (ja) 1983-04-18
EP0077199A2 (en) 1983-04-20
DE77199T1 (de) 1983-08-18
EP0077199A3 (en) 1984-11-21

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